Index: tests/unit_tests/test_imports.py
===================================================================
diff -u -rb543d90a50cbef509d10f4c1412d87bf6eee2e4e -rf194e9e62ce2513823f5320774bc793448ee3809
--- tests/unit_tests/test_imports.py	(.../test_imports.py)	(revision b543d90a50cbef509d10f4c1412d87bf6eee2e4e)
+++ tests/unit_tests/test_imports.py	(.../test_imports.py)	(revision f194e9e62ce2513823f5320774bc793448ee3809)
@@ -102,6 +102,7 @@
         from dialin.dg import TemperatureSensors
         from dialin.dg import DGValves
 
+        from dialin.ui import HDSimulator, HDProxyAlarms
 
 if __name__ == '__main__':
-    unittest.main(verbosity=2)
+    sys.exit(unittest.main(verbosity=2).result.wasSuccessful())